Limit sliding gauge



Aug. 7, 1934.

R. SALZBREN NER 1,969,624

LIMIT SLIDING GAUGE Filed' Dec. 16, 1930 2 Sheets-Sheet, l

f l humm l 3/ A F19. 7b.

l 'f/ ff( Jn ven/or:

Aug. 7, 1934. R. sALzBRENNER 1,969,624

LIMIT SLIDING GAUGE Filed Dec. 16. 1930 2 Sheets-Sheet? Fig. 1f.l

Patented Aug. 7, 1934 UNITED STATES LIMIT sLIDING -GAUGE- n Rudolf Salzbrenner, Mulheim-Ruhr, Germany uw.Application December 16, 1930, Serial 1510.502336 j In VGermany August 29, 1928 3 Claims.

The products of workshops of every description, more especially the products of rolling mills and other workshops for turning out finished articles, must always be tested for tolerance in cross-section and in the measurements. Apart from micrometer gauges for making extremely small measurements, use. is made in these tests, firstly of the ordinarysliding gauge, and secondly of the ordinary limit gauge.

The checking of measurements in rolling mills and in many other Workshops is a checking of limits, that is to say itis less a question of obtaining one single exact measurement than it is one of determining whether a measurement lies within a particular range of dimensions. Accordingly the instruments for checking measurements need in practice to combine two measurements, one corresponding to the lower limit and the other to the upper limitV of tolerance.

The ordinary sliding gauges employed do not fulfil these requirements. With them one measurement only is ever possible, thatis t0 say, the true measurement. Forevery single check the slide must be' moved 'and the measurement read off. This repeated adjustment of the sliding gauge not only consumesrnuch time, but it is a manifold source of error, such as inexactness due to bad lighting of the shop, or to fatigue on the part of the member of the stai making the check, and to general inattention oi the operative. These sources-of error are eliminated by the limit-gauges now'generally used by reason of the fact that the limit gauges have two fixed measurements for ianyl particular size of work, a minimum and a maximum. They have, however, the disadvantage that for each size of work a special limit gauge is necessary, as the two xed measurements correspond only to the limits of measurement of one particular piece of work. In connection, for example, with the various measurements of work which occur in rolling mills it is necessary to have as many limit gauges as different pieces of work; this is, however, impracticable.

The limit sliding gauge according to the invention combines the advantages of the ordinary sliding gauge with those of the limit gauge While eliminating the disadvantagesof both: just as with the ordinary sliding gauge, so with the gauge according to the invention, with which every single measurement can be read with exactness; but in addition it can be used for every desired measurement as a limit gauge with xed limits of measurement adjustable for all sizes of Work. A

According to the invention,` an additional slide is mounted in or on one of thetwo measuring members of the-sliding gauge so as to be capable of movement along the graduated'rule 'of the sliding gauge and secured. `It will be understood that according to the invention such an additional slide can be mounted reither inthe xed or in the moving measuring member.

Several examples ofthe sliding gauge according to the invention are illustrated in the accompanying drawings, in which;

Figure 1 is a view of one form of the limit sliding gauge having an additional slide in the movable member. y

.Figure la vshows the movable member with ther clamping mechanism in partial section.

Figure 1by is a,V cross-section along line Z-Z of Fig. la. A 75,

VFigure 2 shows anotherA form of the ,limitfslidinggauge with: an .additional slide in the fixed member. g

Figure 3 shows still another form of the sliding gauge with two additional slides one on the fixed and one on the movable member.

Figure 4 shows aV formraccording to Fig. 1 but with a micrometer on'the movable member.

Figure 5 shows therform of Fig. 2 but with a micrometer4 on the fixed member.

Figure lshows the form of Fig. 3 with a miorometer both on the fixed and ,the movable member. l

In the figures a graduated rule 2 has a measuring `member 1 Yfixed thereto, Vwhile a second measuring member 3 is movable along the rule and provided with a Vernier applied to the scale on the rule. The members l and 3 are provided with co-operating measuring surfaces, that are accurately worked surfaces adapted for precisely g5 measuring the thickness or length of a workpiece inserted between them. An additional slide 4 is inserted in an offset portion of at least one of the measuring members. This slide has also a measuring surface co-operating with that 1.00 of the opposite measuring memberY and is provided with a Vernier scale which is applied to, a scale on the movable member 3. 5 is a device for setting the two slides with respect to each other and with respect to the graduated rule 2.

Figures 1a and 1b show the clamping mechanism in partial longitudinal and cross section. A tubular nut a is rotatable in a bore of the main slide 3, and is longitudinally sldable for a slight extent. It is provided at its end with an adjusting disk 5, which is freely accessible in the rectangular opening of the main slide, and at its other end it has an annular connection ai, which lies in an annular depression c of mainy slide 3, and is lsupported against a narrow side of the measuring rod 2. The pin b is screwed in the nut aand its projecting end is mounted in a bore of the auxiliary slide so as to be longitudinally slidable. Rotation of the pin is prevented by projections bi, .which slide in longitudinal slots d of the bore. If the disk -5 is rotated in the direction for clamping then the nut a and the pin b move away from each other, so that the connection ai of the nut is pressed against the measuring rod 2, and the free end of i pin b against the narrow surface of auxiliary slide 4. Thereby, on the one hand, the main slide 3 is clamped relative to the 'measuring rod 2, and on the other hand, the auxiliary slide 4V relative to main slide 3, so that the auxiliary slide 4 is also xed in positionrelative to measuring rod 2. Rotation of the disk 5 in the opposite direction effects the simultaneous release of main slide 3 and auxiliary slide 4 from rod 2V, and the auxiliary slide in turn from the main slide.

The member 3 is moved from the stationary member 1 a distance equal to the minimum admissible measurement of the work being examined; the additional slide 4 is moved to the right with respect to the member 3 a distance equal tothe total admissible tolerance; thus the distancebetween the additional slide 4 and the fixed member 1` is equal to the maximum admissible measurement of the Work being examined.- By setting the two slides 3 and 4 by means of the device 5, the sliding gauge is converted into the constant limit gauge. Thus everydesired space as tolerance for the most diverse measurements canl be set in the simplest conceivable manner withinthe shortest space of time. The sliding gauge according to the invention4 isthus a perfect substitute for an unlimited number of xed limit gauges.

In the Vconstruction of instrument illustrated in Figure 2, the additional slide 4, which in Figure 1 is provided inthe movable member 3, is provided in'the fixed member 1.

A further modication consists in providing two additional slides 4, one in the fixed member 1 and the other in the moving member 3, as shown in Figure 3. Y

To secure a still more exact reading than is possible with the Vernier scale, the Vernier scale which both the moving member 3 and the xed member 1 eachl carries a micrometer 6.

The sliding gauge according to the invention is suitable not only for testing the products of rrolling mills, but canwith equal advantage be used in all other Workshops particularly where use is made in mass production of products to be tested for tolerance.

I claim:

l. A gauge of the .class describedcomprising a rule'having a xed member, a measuring member movable along the rule, a slide adjustable in the movable member, and means carried by the movable member and operable to simultaneously secure the slide in adjusted positions in said member, and the member on the rule.

2. A gauge of the class described comprising a rule having a xed member, a slide adjustable in the xed member, a measuring member movable along the rule, a second slide adjustable in the movable member, and means carried by the movable member and operable to simultaneously secure the second slide in adjusted positions in said member, and the member on the rule.

3. A limit sliding gauge comprising in combination a rule which is provided with 'a scale, a Ameasuring member xed on the rule having a measuring surface, a second measuring member movable along the rule andbeing provided withan index cooperating with the scale of the said rule, the said movable member having a measuring surface arranged opposite that of the fixedmember, and a third measuring member movably arranged within at least one of the said measuring members to slide parallelly to the said rule, the said second and third measuring members being provided one with a scale and the other with an index independent of 'the rst mentioned scale and index so that the two limit measures may. be directly adjusted between the cooperating measuring surfaces of the gauge. Y

vRUDOLF SALZBRENNER. 

